Coil-winding form



Aug. 30 1927.

H. J. COCKS COIL WINDING FORM Filed Sept. '7, 1926 Patented Aug. 3o, 1927. (1.1 5

UNITED STATES PATENT OFFICE".

HARRY J'. COCKS, 0E DES MOINES, IOWA, ASSIGNOR TO METAL PRODUCTS COMPANY, OF DES MOINES, IOWA, A CORPORATION OF IOWA.

COIL-WINDING FORM.

Application led September 7, 1926. Serial No. 183,835.

The object of my invention is to provide a coil winding form of the kind employed in winding coilsfor radio equipment. e

More particularly, it is my object to provide a form of this kind of very simple, durable and inexpensive construction, having parts which can be readily and easily assembled and mounted on a rotating shaft, and which can be quickly and easily removed from the shaft.

Another purpose is to provide such a form in which the pins are mounted in such manner that they may be easily removed after the coil has been sold without injury or distortion to them or to the coil.

With these and other objects inl view, my invention consists in the construction, arrangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and

illustrated in the accompanying drawings, 1n which:

Y Figure 1 is a front elevation of a coil lwinding form embodying my invention.

Figure 2 is a side elevation of the same; and

Figure 3 is a horizontal, sectional view taken on the line 3 3 of Figure 1.

In winding tuning coils of certain kinds for radio equipment, the coils are wound on cores or forms having a series of equi-distantly spaced radially extending pins.

After the coil has been wound, the core with the coil thereon is taken from the shaft, and a rubber cement is then applied to the coil to seal the windings so that they can not separate.

Heretofore, it has been the customto use a core, comprising a disc having a series of radially arranged holes in its circumference and to force into these holes the ends of pins in which a slot has been formed. There is enough resiliency in such pins so that when the slotted ends are forced into the holes, the pins will stick or be held by friction.

After the rubber cement has been applied, these pins must be pulled out and this is ordinarily done with a pair of pliers. kOwing to the fact that the pins stick in the cylinder, the necessity for hard pulling on the pins sometimes breaks the seal of the rubber cement on the windings, thus injuring the coils. The use of a pair of pliers on the ends of the pins roughens them, so that when they are again used for winding another coil, the rough places are likely to scrape the insulation from the wire from which the coil is Wound, thus causing a short in the coil. v

In order to provide a form in which thes undesirable results may be eliminated and which will facilitate the proper operations necessary in winding a coil, I have provided the form herein shown.A Y

In the accompanying drawings, I have used the reference numeral 10 to indicate generally the shaft on which the form is .mounted y The shaft has at its end a reduced spindle 11 and beyond that a smaller spindle 12.

.. It is thus seen that there is formed a shoulder 13 at the end of the shaft and adj acent to the spindle element 11.

The spindle member or portion 11 is provided with a ,suitable slot 14C for a halfmoon key 15.

My improved form comprises an annular disc-shaped member 16 having in one side an annular recess 17 and having a central opening 18 to receive the spindle 11, and having a slot 19 to receive the halfmoon key 15, whereby the form is locked on the shaft against rotation with relation thereto.

The disc 16 is provided with a series of radially arranged, circumferentially spaced holes 20 extending from the periphery of the disc inwardly, as shown in Figure 3. The holes 20 and the recesses 17 overlap so that pins 21 inserted into the holes 20 will pro-ject into the recesses 17 for a short portion of their length and for about half of their thickness.

The holes 2O are of such size as to allow the pins to be freely inserted and withdrawn without binding.

A lockingplate or disc 22 is provided with ahole 23 to receive the reducing spindle portion 12 and is adapted to grip the inner ends of the pins 21, as shown in Figure 3 and to be locked in position by means of a wing nut 211 screwed onto the screwthreaded end of the spindle 12.

The holes 20 are made just about snug enough so that the pins can be pushed in and will not drop out of their own weight, but may be easily pulled out without any strain on them or on the coil.v

In practical use, the disc 16 is'placed on the shaft with the pins inserted in it. The' locking plate 22 is placed in position on the spindle member l2 and the wing nut 24- 1S screwed uonto the spindlememberl2, engaging the inner ends o t' thepins 2l and locking them against accidental'removalf The coil is then Wound on the xterm, .and when finally the winding is finished, the

wing nut 24 is removed and the form; with the coil thereon is taken of the shaft.

The plate 22 may be taken off, but the pins 2l will be held in position by their trictional engagement with the windings.

The windings are then treated with rubber cement, which is allowed to harden.`

The pins 2l can then be grasped in the iingers and ypulled out without any danger of the likelihood of injury` to the coil, which Would occur'it the pins were so tightly held that they must be pulled out with pliers.

A device of this kind has substantial advant'ages over the old type ot coil winding forms in the ease with; which the pins mayl be removed,l which makes it possible to redisc having Aacentralopening toreceive a shaft and having a series otiholes-extending Y radially inwardly from the periphery of the disc, said `disc having inroneside anaannular recess, a locking. plate adapted to be projected into said recess having a central hole tov receive a spindle, a plurality of pins having their inner ends received in said holes and projecting-into said recess for portions ot their lengths and portions of their diameters, and means for lockingsaid plate in said recess iior gripping and holding said pins. s Y

' 2. Ina form for Winding coils,` an annular disc having a central opening to receive a shaft and havin@ a series otholes-extendi'ng radially inwardy trom the periphery of the disca said disc havingin one side arr-annular recess, a locking plate adaptedfto'be projected into said recess havingV affcentralf hole to receive av spindle, a plurality of pins having their inner ends received in said holes and projecting into said recess, forportions of theiriengths and portions of their'diameters, and means for locking saidfplate. inl

said recess -for gripping andiholding said pins, a shat'thaving a reducedfendfand a reduced spindle on said end, said reducedend being `received in the hole inthe disc, .and

said spindle being received in thehole inA the plate and being screw-threaded,1and a nut on said'screw-threaded end yfor locking said plate in position for vholding thetorm on the shai'tand locking the pins in place.

HARRY J; GOCKS. 

